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As of March 2013, Google Play Books supports third-party ePub or PDF files. You can upload books to your account by visiting https://play.google.com/books/uploads in your web browser (when logged in to your Google account, of course). You are permitted to store up to 1,000 uploaded files on your account at a time, and each file must be no larger than 50 MB ...

I checked several sources on this. Googles own help page states:
The Google Play Books app automatically stores books in the location with the most free space, whether that's your device or your SD card, as of when the app was first launched. If you've upgraded your app, your books will continue to be stored in the same location they were before the ...

Go to Google Play Books, find the book(s), click on the menu (three vertical dots), choose "Remove from my library", and agree to the confirmation that pops up.
The books should now be gone from your library and will, once your device syncs, be gone from the device as well.

To return to the last page you visited, you can just tap on the screen to notice a bar in the bottom. If you look closer you can see a blue triangle that marks the last visited page. Click on it and you'll return to that page!
Click image for larger version
Hope this helps.

Turns out the last paragraph added to the book is meant and of course not turning it in the overview.
This is the information:
This is a digital copy of a book that was preserved for generations on library shelves before it was carefully scanned by Google as part of a project to make the world’s books discoverable online.
It has survived long enough for ...

There are several apps you might check (ordered best recommendation first):
Moon+ Reader Pro is the best ebook reader I know. Support for the important formats (txt, html, epub, pdf, umd, fb2, chm, zip -- pdf only in the pro, said to be the fastest PDF renderer on Android), plenty libraries pre-configured to download books from (you can add your own ...

Amazon has just updated their Kindle app to offer a two column layout for tablets. I was thrilled that they did this. Google Pay Book reader has that two page layout and I really preferred that on my tablet.
Kindle app will also read PDF files. I don't think it will do EPUB but there might be a converter out there to make it into Kindle format.
There are ...

You can import/upload them:
Uploading the PDF/ePub file(s) to your Library
Go to My Books
Click on 'Upload File' in the top right corner.
Choose the file(s) you wish to upload.
Getting the PDF/ePub files in you App
Go into your Google Play Books App.
Click on the button on the top left ('Read Now' or 'My Library').
Select 'My Library'.
Click on the ...

I'm afraid this is impossible. It's the number one most requested feature but, as far as I can tell, there are no plans to implement it. I suspect this is because Google is under quite a lot of fire for enabling piracy. Allowing people to load their own books into the books app would intensify that.

I don't think Google Books has a voice interface, which is a shame. I don't know of any book app which does, I'm afraid. Moon+ Reader is a great ebook app which has auto page turning, based on time, but they are very active and are always adding features - it may be worth emailing them and asking if they will implement it?

You can select "enable PDF uploading". This will allow you select all your books and upload to your Google account. That way, you can read from any device by just signing in. And you can select to view offline.
This reduces the amount of data needed on your device.

If you want to add books you downloaded on your computer, the books are stored in: /data/data/com.google.android.apps.books/files/accounts/{your google account}/volumes, and when you are inside the "volumes" folder you will see some folders with a name that is some code for that book. Once you click one of those folders you will see 2 .png files: those are ...

You can import/upload them:
Uploading the PDF/ePub file(s) to your Library
Go to My Books
Click on 'Upload File' in the top right corner.
Choose the file(s) you wish to upload.
Getting the PDF/ePub files in you App
Go into your Google Play Books App.
Click on the button on the top left ('Read Now' or 'My Library').
Select 'My Library'.
Click on the ...

I think your question could be worded better as it seems to ask a couple of questions.
Google books are filed as cryptic alphanumeric IDs, and they seem to be HTML type files it makes it more difficult than with most other book types.
finding books on your device is very easy, use an explorer like File Expert or Astro (both are free, however Astro's ...